OneDrive REST API - Upload - Content of .png file converted to jpeg - rest

Question

When using the OneDrive REST API to upload files, the content of some files with a .png extension is automatically converted to JPEG. I'm able to reproduce the problem with both documented upload methods.
Sample png files:
http://www39.zippyshare.com/v/59255310/file.html
http://www2.zippyshare.com/v/11270772/file.html
For reference the shortened requests:
PUT method
PUT https://apis.live.net/v5.0/folder.<removed>/files/i2.png HTTP/1.1
Pragma: no-cache
<removed - no Content-Type header>
Content-Length: 33579
Host: apis.live.net
When the Content-Type in the header of the PUT request is set to application/octet-stream the following error is returned:
HTTP/1.1 415 Unsupported Media Type
Server: Live-API/19.7.925.4009 Microsoft-HTTPAPI/2.0
<removed>
{
"error": {
"code": "request_body_invalid_media_type",
"message": "The Content-Type header 'application/octet-stream' isn't supported."
}
}
POST method
POST https://apis.live.net/v5.0/folder.<removed>/files HTTP/1.1
Content-Type: multipart/form-data; boundary=735b1931-a2bb-4970-8142-373848528fcb
<removed>
Content-Length: 33767
Host: apis.live.net
--735b1931-a2bb-4970-8142-373848528fcb
Content-Disposition: form-data; name="file"; filename="i2.png"
Content-Type: application/octet-stream
.PNG<removed>
--735b1931-a2bb-4970-8142-373848528fcb--
Other OneDrive APIs
The problem does not happen with the API (skyapi.onedrive.live.com/API/2) Microsoft is using on the OneDrive website and in the Windows desktop client (skydrive.exe).
OneDrive developers:
Instead of returning a 415 error in the PUT request, would it be possible to support requests where the Content-Type: application/octet-stream header is set? In this case the data should be left as is without doing any data conversion. Thank you.

Answer 1

This is documented behaviour as per http://msdn.microsoft.com/en-us/library/dn659726.aspx (see the first note under uploading).
If you want to disable conversion, you can set downsize_photo_uploads=false in your query string.